scholarly journals Synthesis and analysis of dielectric bifocal lenses.

2018 ◽  
Vol 2018 (8) ◽  
Author(s):  
V. A. Kaloshin ◽  
◽  
Huu Duc Nghiem ◽  
Keyword(s):  
2008 ◽  
Vol 23 (2) ◽  
pp. 54-58
Author(s):  
Debbie Rohwer

Because issues involved with playing an instrument may be complicated by the aging process, age may be an important variable to investigate in health studies. The current study examined the perceived health challenges of a group of adult instrumental musicians and possible accommodations for these challenges. Participants included 83 adult white musicians, aged 47 to 91 yrs, 52 females and 31 males, who were attending a national summer senior band camp. Fifty-two played woodwind and 31 brass or percussion instruments. The participants were given a questionnaire asking about (1) the degree of trouble with vision, hearing, finger/hand, arm/neck, back/leg, and other physical ailments while playing their instrument; (2) whether any pain experienced was greater when playing music than in everyday life; and (3) accommodations they may have found for any physical troubles they experienced. Visual problems when reading music were noted as the participants' greatest challenge, followed by finger/joint pain, hearing speech, and hand pain. Visual problems when reading music were a top concern across all instrument subgroups, followed by finger/joint pain for woodwind players, hearing speech for brass players, and both hand and finger/ joint pain for percussionists. Accommodations for vision problems most commonly included placing the lens line higher on bifocal lenses so that both the conductor and music could be seen. Accommodations for ailments centered around two general issues: things a musician could buy (e.g., ear plugs, instrument rests, cushions) or things they could do to avoid pain (e.g., education, stretching).


1908 ◽  
Vol 10 (1) ◽  
pp. 41-69
Author(s):  
Val H Mackinney
Keyword(s):  

1966 ◽  
Vol 43 (2) ◽  
pp. 71-86
Author(s):  
Wolfgang Roos ◽  
John W. Mc Connell
Keyword(s):  

1941 ◽  
Vol 18 (3) ◽  
pp. 124
Author(s):  
&NA; &NA;
Keyword(s):  

Author(s):  
A. Denker

Abstract. The project of smart cities has emerged as a response to the challenges of twenty-first- century urbanization. Solutions to the fundamental conundrum of cities revolving around efficiency, convenience and security keep being sought by leveraging technology. Notwithstanding all the conveniences furnished by a smart city to all the citizens, privacy of a citizen is intertwined with the benefits of a smart city. The development processes which overlook privacy and security issues have left many of the smart city applications vulnerable to non-conventional security threats and susceptible to numerous privacy and personal data spillage risks. Among the challenges the smart city initiatives encounter, the emergence of the smartphone-big data-the cloud coalescence is perhaps the greatest, from the viewpoint of privacy and personal data protection. As our cities are getting digitalized, information comprising citizens' behavior, choices, and mobility, as well as their personal assets are shared over smartphone-big data-the cloud coalescences, thereby expanding cyber-threat surface and creating different security concerns. This coalescence refers to the practices of creating and analyzing vast sets of data, which comprise personal information. In this paper, the protection of privacy and personal data issues in the big data environment of smart cities are viewed through bifocal lenses, focusing on social and technical aspects. The protection of personal data and privacy in smart city enterprises is treated as a socio-technological operation where various actors and factors undertake different tasks. The article concludes by calling for novel developments, conceptual and practical changes both in technological and social realms.


2021 ◽  
pp. 25-29
Author(s):  
M.M. Bikbov ◽  
◽  
O.I. Orenburkina ◽  
A.E. Babushkin ◽  
◽  
...  

Purpose. To study the results of femtosecond laser-assisted cataract surgery (FLACS) using RayOne diffractive trifocal IOLs in comparison with bifocal lenses. Material and methods. The patients were divided into 2 groups: the first group included 32 patients (46 eyes) who were implanted with a bifocal refractive IOL M-flex 630 F with +3 dptr addidation during FPCS. The second group consisted of 34 people (49 eyes) with implanted RayOne trifocal IOL. The surgical treatment was evaluated by determining uncorrected visual acuity (UCVA) in the distance, at close (30-45 cm) and medium distance (50-70 cm) at discharge, 1 month and six months after the operation in photopic and mesopic lighting conditions, with the study of postoperative refractometry data, the construction of a defocusing curve, and subjective assessment of patient satisfaction. Results. A month after tthe operation the postoperative spheroequivalent in the range of ±0.5 D was achieved in group 1 in 82.6% of cases and in group 2-in 91.8. Six months after surgery near visual acuity without correction in photopic and mesopic light conditions was on average 0.61±0.08, while in patients of group 2, the average values were recorded at 0.64±0.09 and 0.62±0.07, respectively. By this time, the patients of group 1 had significantly lower rates of UCVA at long and medium distances: 0.81±0.08 in photopic lighting conditions and 0.79±0.08 in mesopic conditions, and group 2 0.41±0.08 and 0.40±0.10, respectively. Conclusion. Patients who underwent FLACS with an implanted RayOne trifocal IOL, compared with patients with bifocal IOLs, had higher rates of subjective satisfaction with the results of surgical treatment and UCVA at various distances (including greater comfort with actions performed at close and medium distances) at different light levels. Key words: multifocal IOLs, femtosecond laser-assisted cataract surgery, RayOne Trifocal.


1993 ◽  
Vol 16 (1) ◽  
pp. 25-36 ◽  
Author(s):  
Russell L. Woods ◽  
John E. Saunders ◽  
Michael J.A. Port
Keyword(s):  

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